Furnace



FURNACE J. L. GRETHER Filed Nov. 5, 1925 .I .llIA -5..

Sept.' 12's Patented Sept. 2S, 1926.

JOHN GRETI'EER, OF ST. LOUIS, MISSOURI, ASSIGNOR TG PAUL W'. GRETHER, O lv terr/i YST. LOUlS, MISSOURI.

FURNACE.

Application filed November 5, 1923. Serial No. 672,866;

The prima-ry object of this invention is to provide certainimprovements in a heating furnace or the like whereby a greater.

amount of heat is quantity of fuel.

'Another object of the invention is in providing a heatingrfurnace with an improved arrangement ot discharging passageway for the discharge'ofjthe vproducts of combustion for increasing the heatingeiiiciency of the vfurnace. o e

r'rurther object ofthe invention is in providing improved means in a heating furnace forgentraining the fresh air to and from the heating chamber of the furnace.

A still further object oic the invention is in providing a heating furnace with an improved form or method yof associating the fresh air entraining passageways with the .products of combustion discharging passageway.

ther and further objects will appear in the specification andbe specifically pointed out in the appended claims, reference being Aderived trom a' given had to the accom an `7ing drawings eXemb D B plifying the invention and in which:

Figure 1 is a vertical section taken through this improved furnace. l Y

Figure 2 is a horizontal section taken Aon the line lll-II of .F ig. 1. y

y .ln the accompanying drawings, 1 designates a tire-pot which is surrounded by the usual lire-brick lining 2 and arranged above the tire-pot is the combustion chamber 3 and located beneath the re-pot 1 is the usual Vash-pit a having the grate bars V5 arranged thereabove. The fire-pot 1 and combustion chamber 3 are surrounded by a verticaliy extending annular wall 6 and extending horizontally from said wall is a tubular extension 7 forming a passage 8 to enable the passing ot tuel to the iire-pot when the fire-door 9 is opened. 'A passage 10 is provided for providing access to the ash-pit 4i, said passage 10 being formed by the horizontally extending wall 11 which is also extended romthe annularwall 6, said passage 10 being controlled by the ash-pit door 12.

Mounted on top of the annular wall 6 is a 4drum like structure ,13,k said structure 13 beingflarger in diametervthan the combustion chamber 3 and having the upper exrtremity of its annular wall disposed outwardly beyond the lower extremity thereof as designated at 14.

Mounted upon the upper edge of the an# nular disposed portion 11i and secured there'- to lbyv bolts such as 15 is an annular horizontally disposed portion 16 of a hollow member r17, said hollow member having a raised bottom portion 18, said bottom portion being held a distance above the horizontal portion 19 of the drum like structure 13, thereby providing a passageway 19a.

YThe drum like structure 13 and the hol- `low member v17 are preferably cylindrical in shape, the hollow member 17 being smaller in diameter than the drum 13 and arranged in eccentric-position to the drum13, This eccentric. position ofthe drum 13 and the hollow member 17 to each other provides an annular passageway 20 between said drum and hollowineinber in which said passageway on one side is restricted as designated at 21,

The outward disposition of the portion 14 of the drum 13 relative to the hollow member 17, provides an enlarged annular passageway 22, said passageway being. much larger in cross sectional area than the passageway 20 and leading from said enlarged passageway 22 is a discharge outlet 23 vvwhichdischarges into the pipe orstack 2li.

Surrounding the partsv describedl is a drum forming an air heating chamber 26 andv leading to said chamber at the lower tion arising from the combustion chambei'f 3 will entrain upwardly ,and outwardly from the combustion chamber into the passageway 19EL andy from there into the annular passageway 2O and upwardly to the enlarged annular passageway 22 and from end isa fresh air duct 27 and resting upon A .the upper edge of the druin 25 is a hot air said annular passageway 22 the products ot combustion will be discharged through the discharge outlet 23 into the stack 24.

The heated products of combustion `troni the fire-pot 3while passing beneath the raised bottom 1S ot1 the hollow member 17 and while ascending the annular passageway 2t) will thoroughly heat the walls ot the hollow member l? and the drum 125, said walls there-tore radiating a maximum of heat.

yEhe "fresh air entrained into the drum through the duct 2T upon ascending upwardly in the drum Q5 will surround the heat giving otl' drum kland .will be heated thereby, and as the air currents continue on upwardly within the drum they will be entrained down-.vardly in the direction ot the arrows-3l as they pass 'over the horizontal portion 1G ofthe A'hollow member 17 and will be entrained into the heating chamber provided by said hollow member thereby being further heated within said chamber.

Vliter the air currents have been received within the heating chamber 32 they will be discharged there-'trom into the intake flue and into the hot air dome 28 from where theyv `will be discharged into the distributing ihre/s 29 which lead from the hot air dome 28.

This manner ot entraining the fresh air currents into peculiarly formed enclosures or passageways which are made from the peculiar' enclosing of the passagew-ays through which the products oit combustion are discharged, provides for a system of air entrainmentin connection with a furnace in which a maximum heating eiiicien'cy is given to the entrained air currents. i' To eliminate short cutting of the travel of the products of combustion from the combustion chamber to the stack 24, the annular passageway 2O is restricted 'on one side as designated at 2l. In this instance the restriction on one side of the annular passageway 20 is provided by the hollow inemhcr l? being disposed eccentric to the drum 13, the restriction being provided on the stack side of the furnace, said restricted side oi the annular passageway forcing the ascending` products ot combustion to travel upwardly annula-rly within the passageway Q0.

lVhat l claim is l. A furnace comprising a surrounding drum, a lire-pot arranged within said drum, a hollow member closed at its lower end arranged above said lire-pot, a surrounding wall extending from said lire-pot around said member arranged so as to provide an encircling passageway which is restricted on one side for the discharging of the products of combustion from 'saicl'fii"e} ot,'a chamber formed above said hollow member, and an intake liue leading to said chamber.

2. A furnace comprising a surrounding drumya lire-pot arranged within said drum, a hollow member closed at its lower end arrangedV above said. fire-pot, a surrounding discharging ot the products ol' combustion from said lire-pot, a chamber' formed above said hollow member, and an intake lluc leading to said chamber depending within said hollow member.

3. In a hot air furnace the combination ot a combustion chamber, a hollow member closed at `its lower end located above said chamber, a wall surrounding said hollow member in Aolset relation thereto thereby providing an encircling passageway tor the discharge of the products ot' combustion trom said chamber, an outlet flue leading Jr'rom said hollow member, and means provided by said hollow member and said liuc whereby air currents will be introduced into said hollow member beneath said liue.

l. ln a hot air furnace the combination of a surrounding drum, a combustion chamber located within said drum, a hollow member closed at its lower end located above said chamber, a wall surrounding said hollow member in oii'set relation thereto thereby providing an encircling passageway for the discharge ot' the products of combustion 'from said chamber, an outlet flue leading from said hollow member, means provided bv said hollow member and said llue whereby air currents will be introduced into said hollow member beneath said flue, and a discharge pipe leading from said encircling passageway'.

In a furnace the combination of a coni-v bustion chamber, a hollow member closed at its lower end located above said chamber, a wall surrounding said hollow member thereby providing an annular passageway which leads from said combustion chamber, said passageway being restricted on one side, a discharge pipe leading lrom said passageway on the rest icted side thereof. and an out-let flue co-operable with said hollow member.

6. In a furnace the combination of a com bustion chamber, a hollow member closed at its lower end located above said chamber, a wall surrounding said hollow member thereby providing an annular passageway which leads from said combustion chamber, said passageway being restricted on one side. a discharge pipe leading` from said passageway on the restricted side thereof, an outlet tlue depended within said hollow member. said flue 'being smaller in diameter than said Vhollow member, and a drum arranged surroundingly of said combustion chamber and said surrounding wall.

7. In a furnace the combination of a combustion chamber, a hollow member closed at its lower end located above said chamber, a wall surrounding said hollow member therelll by providing an annular passageway which leads from said combustion chamber, said wall at its .upper end being disposed outwardly thereby forming an annular enlargement, said passageway being restricted on one side, a discharge pipe leading from said annular enlargement on the restricted side of said passageway, an outlet flue co-operable with said hollow member and a drum embracing said combustion chamber and said surrounding wall.

8. in a furnace the combination of a combustion chamber, a hollow member closed at its lower end located above said chamber, a wall surrounding said hollow member thereby providing an annular passageway which leadsl from said combustion chamber, said passageway being restricted on one side, said wall at its upper end being disposed outwardly, thereby :forming an annular enlargement,l a discharge pipe leading from said annular enlargement in proximity to the restricted side of said passageway, and a drum embracing said combustion chamber and said surrounding wall.

JOHN L. GRETHER. 

